Northwest Instrument NRL600 Series Automatic Leveling Rotating LaserNRL600 Series rotary laser levels, as with all the Northwest technology, are engineered with top of the line production. Capability The NRL602 is perfect for leveling, alignment and squaring, especially when building foundations, patios, drop ceilings, decks, cabinets installation, framing and tiling. This laser features many important indoor attributes including wide sweep, narrow sweep and dual beam squaring (standard on all models) for both level and plummet. Accuracy The Northwest Self Leveling Laser is accurate 1/8 in at 100ft. with an operating range of 800 ft with Detector.